Prime Minister Sir Keir Starmer is being kept updated on the latest developments.
He posted on X: “The scenes in Liverpool are appalling – my thoughts are with all those injured or affected.
“I want to thank the police and emergency services for their swift and ongoing response to this shocking incident.”
Conservative leader Kemi Badenoch said the pictures were “deeply worrying”.
“My thoughts are with all those affected, and the emergency services as they respond to what appears a horrific incident,” she said.
Liverpool FC said it was in contact with the police and its “thoughts and prayers are with those who have been affected by this serious incident”, while rivals Everton FC echoed the sentiment.
